Radial velocities and membership of stars in the old, distant open cluster Berkeley 29

Free access article

Issue		A&A Volume 429, Number 3, January III 2005


Page(s)		881 - 886
Section		Galactic structure, stellar clusters and populations
DOI		http://dx.doi.org/10.1051/0004-6361:20041049

A&A 429, 881-886 (2005)
DOI: 10.1051/0004-6361:20041049

Radial velocities and membership of stars in the old, distant open cluster Berkeley 29

A. Bragaglia¹, E. V. Held² and M. Tosi¹

¹ INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
e-mail: [angela.bragaglia;monica.tosi]@bo.astro.it
² INAF - Osservatorio Astronomico di Padova, vicolo Osservatorio 5, 35122 Padova, Italy
e-mail: held@pd.astro.it

(Received 7 April 2004 / Accepted 28 August 2004)

Abstract
Multi slit spectroscopy at the Telescopio Nazionale Galileo was employed to measure radial velocities for 20 stars in the direction of the old open cluster Berkeley 29, the farthest known in our Galaxy. Membership information was derived for stars all along the red giant branch, in particular near its tip, and on the red clump. The sample of bona fide cluster members was used to revise the cluster distance to $\sim$ 15 kpc, on the basis of an empirical comparison with the red clump in open clusters with known distances. A metallicity [Fe/H] = $-0.74 \pm 0.18$ was also estimated using the colours of spectroscopically confirmed red giant stars.

Key words: Galaxy: disk -- Galaxy: open clusters and associations: individual: Berkeley 29 -- techniques: radial velocities

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